Scroll type compressor having an elastic member to suppress noise and reduce variations

Abstract

Provided is a scroll type compressor which reduces variations in the pressing load of a rotating scroll on a fixed scroll, reduces the impact at the start of the compressor and suppresses noises, and can provide excellent durability. A peripheral elastic body 51 and a bottom-portion elastic body 52 , which is brought into a compressed condition in the axis line direction of the main shaft 31 , are interposed between a stopper pin 41 on the rotating scroll side and a concave portion 42 on the main shaft 31 side, whereby working errors of each part are compensated and the rotating scroll is constantly brought into close contact with the fixed scroll to maintain the sealing of the compression chamber.

The invention claimed is: 
     
       1. A scroll type compressor comprising:
 a main shaft that is rotatably supported in a housing that constitutes an outer shell; 
 a rotating scroll that is rotatably connected to a position offset with respect to a center of the main shaft; 
 a fixed scroll that forms a compression chamber compressing a cooling medium by being opposed to the rotating scroll and is fixed to the housing; 
 a balancer that is provided integrally with the rotating scroll and reduces the imbalance of the rotating scroll; 
 a convex portion which is provided in one of the main shaft or the balancer and protrudes in a direction parallel to an axis line of the main shaft; 
 a concave portion which is provided in the other of the main shaft or the balancer and has an inside diameter larger than an outside diameter of the convex portion and into which the convex portion is inserted; and 
 a first elastic body that is provided in a compressed condition in the direction of the axis line between the main shaft and the balancer and exerts a resistance force on the movement of the convex portion in a direction orthogonal to the axis line in the concave portion. 
 
     
     
       2. The scroll type compressor according to  claim 1 , wherein the scroll type compressor further comprises a second elastic body provided between an outer circumferential surface of the convex portion and an inner circumferential surface of the concave portion. 
     
     
       3. The scroll type compressor according to  claim 2 , wherein the second elastic body is provided on an outer circumferential side of a rotational radius of the rotating scroll between the outer circumferential surface of the convex portion and the inner circumferential surface of the concave portion. 
     
     
       4. The scroll type compressor according to  claim 2 , wherein when the convex portion moves in the direction orthogonal to the axis line in the concave portion, a frictional force exerted by the first elastic body is larger than a repulsive force exerted by the second elastic body. 
     
     
       5. The scroll type compressor according to  claim 2 , wherein the first elastic body and the second elastic body are integrally formed. 
     
     
       6. The scroll type compressor according to  claim 2 , wherein the first elastic body and the second elastic body are formed from materials different from each other. 
     
     
       7. The scroll type compressor according to  claim 2 , wherein the first elastic body and the second elastic body have thicknesses different from each other.